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Finding the Fourth Proportional to 20,188.80, 30,269.52 and 10,308.96

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Solution

The fourth proportional to 20,188.80, 30,269.52 and 10,308.96 is: 15,456.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,188.80 : 30,269.52 = 10,308.96 : x
  2. Step 2: Convert to fraction form
    20,188.80/30,269.52 = 10,308.96/x
  3. Step 3: Cross multiply
    20,188.80x = 30,269.52 × 10,308.96
  4. Step 4: Simplify right side
    20,188.80x = 312,047,270.90
  5. Step 5: Solve for x
    x = 312,047,270.90/20,188.80
  6. Step 6: Final answer
    x = 15,456.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.